Here are some scratchbuilt/kitbashed N scale models.

O wagon Carried Limestone from Nowa Nowa. Scratchbuilt in 10 thou styrene by Rob Carpenter

Next is an Aust-N-Rail Series 2 T class super detailed by Paul Blake

An N scale Australia Series 1 T by Paul Blake.

Spirit Design "J" hoppers by Paul Blake... less decals!

Ashley Hillebrand has scratchbuilt IS1, a stretched IY wagon that was used on the Orbost line to carry timber.